Answer:
• Friction is a force that occurs when two surfaces slide past
one another.
• The force of friction opposes the motion of an object,
causing moving objects to lose energy and slow down.
• When objects move through a fluid, such as air or water, the
fluid exerts a frictional force on the moving object. The
frictional force from a fluid is called a drag force.
• Friction examples: tires skidding to a stop on a road,
sandpaper rubbing against wood, air pushing against the
nose of an airplane
• Friction drag force causes objects to slow down as they move through a
fluid, such as air or water.
• Drag force depends primarily on the following variables:
– Cross‐sectional area of an object moving through the fluid
– Speed of moving object
– Density of the fluid
– Drag coefficient (determined by experiments; related to the shape of
the object)
• Drag force is especially dependent on the speed of an object. As an
object’s speed increases, the drag force from the fluid increases
exponentially.
• For example, when you drive at high speeds, the frictional force of air on
the car increases and fuel economy decreases
Hope this helps, have a nice day/night! :D
How would you classify this atom of oxygen?
Answer:
Oxygen is a chemical element – a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus. Oxygen is a gas at room temperature and has no colour, smell or taste. Oxygen is found naturally as a molecule.
How could you break down the compound calcium carbonate into the elements that make it up ? A. by melting B. by crushing C. with filter D. with chemical changes
Answer:
A: By melting
Explanation:
When calcium carbonate is heated it decomposes into calcium oxide and carbon dioxide.
When does the first step of digestion usually occur?
Multiple choice question.
A)
when the organism discovers the food
B)
when the food is chewed
C)
when the food is swallowed
D)
when the nutrients are absorbed
Answer:
B
Explanation:
Firstly, when the food is chewed then the saliva is secreted and mixed with food. Then the food is swallowed and nutrients are absorbed.
Draw Bohr diagrams for the following
example calculation for a.)
N = 39 - P
N = 39 - 19
N = 20
P = 19
What is true about radioactive isotopes of an atom?
They do not break down.
They break down quicker than stable isotopes.
They undergo radioactive decay to form larger isotopes.
They break down to form heavier isotopes.
Answer:
They break down quicker than stable isotopes.
Explanation:
I hope this helps
Have a blessed day
The statement which is true for a radioactive isotope is " they break down quicker than stable isotopes because they are unstable and undergo decay.
What is radioactive isotope?A radioactive isotope is an isotope of an element which is under exposure to a radiation undergoes decay and breaks into lighter isotopes.
Radioactive isotopes are generally heavier and are unstable with short life time. They undergo radioactive decay by alpha/beta or gamma radiation to form stable lighter or smaller isotopes.
Therefore, option C that is, they break down quicker than stable isotopes is correct.
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What is the Uncontrolled variables/limitations for this science expirement? Does the shape of an ice cube affect how quickly it grows? Need help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAP
PLZ help and fast
Compare your responses when you were warned and when you were not warned.
Decide if any of your reactions were reflex responses, and explain your answer.
Infer why organisms have reflex responses to some stimuli.
Answer:
Explanation:
It can possibly be because of genetics in me. For instance: I love dark chocolate, and every time I eat some, it can activate the same photic sneeze reflex as the sun.
In both the Japanese and San Francisco earthquakes, fire killed more people than collapsing buildings. Why do you think this was the case?
If two trucks are moving at the same speed, but truck A has a mass of 3,000 kg, and truck B has a mass of 4,500 kg, what statement is true?
Truck B has less kinetic energy.
Truck A has greater kinetic energy.
Truck B will have a greater stopping distance.
Truck A will have a greater stopping distance.
Answer:
Truck B will have a greater stopping distance.
Explanation:
I did it before
Why do you think the older scientist disregarded the younger scientist's prediction?
5 SENTENCES DESCRIBE THE STEP BY STEP PROCESSES OF HOW THE IMMUNE SYSTEM PROTECTS US. Pls and thank u
Watch this video to help u with the question https://kidshealth.org/en/kids/ismovie.html?WT.ac=k-ra
Answer:
The immune system
Explanation:
The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill. It is made up of various organs, cells and proteins. As long as your immune system is running smoothly, you don't notice that it's there.
Write a paragraph comparing protons, neutrons, and electrons. Be sure to include mass, location, and electric charge.
Answer:
Explanation:
Dalton's Atomic Theory explained a lot about matter, chemicals, and chemical reactions. Nevertheless, it was not entirely accurate, because contrary to what Dalton believed, atoms can, in fact, be broken apart into smaller subunits or subatomic particles. We have been talking about the electron in great detail, but there are two other particles of interest to us: protons and neutrons. We already learned that J. J. Thomson discovered a negatively charged particle, called the electron. Rutherford proposed that these electrons orbit a positive nucleus. In subsequent experiments, he found that there is a smaller positively charged particle in the nucleus, called a proton. There is also a third subatomic particle, known as a neutron.
Protons, neutrons, and electrons are fundamental particles that constitute the building blocks of atoms.
Protons and neutrons are found in the nucleus, the central core of the atom, whereas electrons are located in electron shells surrounding the nucleus. Protons carry a positive electric charge and have a mass of approximately 1 atomic mass unit (amu).
Neutrons, on the other hand, are electrically neutral, meaning they have no electric charge, but they also have a mass of about 1 amu. Electrons, which are much smaller than protons and neutrons, have a negligible mass of approximately 1/1836 amu and bear a negative electric charge that exactly balances the positive charge of protons, resulting in an overall neutral charge for the atom. The combination of these three particles determines an element's chemical properties and behavior in chemical reactions.
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What is the function of peristalsis?
Multiple choice question.
A)
to move food through the digestive system
B)
to remove excess liquid from the body
C)
to chemically digest food to release nutrients
D)
to absorb nutrients into the blood
Answer: A
Explanation
The digestive tract carries out the function of peristalsis by moving food through the system. Peristalsis also removes excess liquid from the body. Chemical digestion breaks down food into small nutrients, but this process does not involve peristalsis. Finally, absorption of nutrients into the blood does not fall under the purview of peristalsis.
Do you think the younger scientist had enough evidence for his prediction?
Answer:
yes
Explanation:
What substances can be released in a volcanic eruption
Harrison is making bread. He prepares some dough and places it into the oven. Harrison realizes a gas, carbon dioxide, is coming out of the dough as it bakes.
Which options are true about carbon dioxide?
A) It is created from the atoms of the dough.
B) It is the dough changing states from solid to gas.
C) It is a new gas released when atoms are destroyed.
D) It is made of atoms that did not exist before.
Answer:
C
Explanation:
Correct me if I'm wrong!!
PLZZ help.
p.s it's fro science the big bang theory
I DON"T KNOOOWWW
Answer:
i think its subatomic particles
Explanation:
GIVING BRAINLIEST!
1. Tom and Tina decided they wanted to start a family. Tom knew his grandfather had sickle-cell disease. Sickle-cell disease is a recessive disorder that causes blood cells to stiffen and take on a crescent shape. These blood cells have a difficult time moving through the blood vessels and can cause health problems. Tina didn’t know of any family members that had it. Still, before they got pregnant they both went to the doctor for genetic tests. The doctor found that even though Tom and Tina were healthy, they both carried the gene for sickle-cell disease. Make a Punnett Square to determine the probability of Tom and Tina’s child having sickle-cell disease.
Use the space below to tell the probability of Tom and Tina having a child with sickle-cell and explain how you determine that.
Why does an object with less mass move faster after a collision with an object with more mass?
Answer:
if two objects of different mass have the same momentum, then the object with the least mass has a greater velocity
The greater the force that is applied to an object of a given mass, the more the object will accelerate
Explanation:
For example, doubling the mass of an object results in only half as much acceleration for the same amount of force
What is energy, what is power, and how are they related?
Answer:
Energy is a force conducted by machinery like PSi ( pressured air ) or naturally aspirated such as electricity or water mills
Explanation:
Power is the amount of energy transferred or converted per unit time.
Provide 3 examples of substances that are mixtures and list the substances in them
Answer:
Water and salt = salt water
Oxygen and water = sea foam
Smoke and fog = smog
Explanation:
Hope this helped, nya~ :3
Are all mutations harmful? Explain.
Answer:
Most mutations are not harmful
Explanation:
but some can be. A harmful mutation can result in a genetic disorder or even cancer. Another kind of mutation is a chromosomal mutation. Chromosomes, located in the cell nucleus, are tiny threadlike structures that carry genes.
by the way this is copyed
can someone please expain newton's second law of motion in a paragraph please? i'll give brainliest
Answer:
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
Explanation:
can i get brainliest now pls
What are the strengths and limitations of your model?
Answer:
Missing Details. Most models can't incorporate all the details of complex natural phenomenaExplanation:
Why do you think the older scientist disregarded the younger scientist's prediction?
Answer:
pls explain, can you show what the younger scientist did.
Explanation:
Renaldo says that concrete is useful because it is a low-maintenance material. Cynthia says that using concrete can be bad because it creates heat islands. Who is right?
-Only Cynthia is right.
-Neither is right.
-Both are right.
-Only Renaldo is right.
HELP PLEASE
ILL GIVE U 100 POINTS!!!!
Using the letters from Betelgeuse and Aldebaran, see how many different words of four letters or more you can make in ten minutes. Each word you make counts as 5 points. Record your words in the Report document.
Answer:
I
Explanation:
scientist created diagram X to represent the molecules of a kind of gas in a closed container. Diagram Y represents the molecules in the container after the size of the container was reduced. The temperature in the container was not changed. What most likely happened to the system when the scientist changed the size of the container? A. Matter was added. B. Matter was removed. C. The pressure increased. D. The pressure decreased.
The most likely outcome when the scientist changed the size of the container is that the pressure increased.
Option (C) is correct.
When the size of the container is reduced while keeping the temperature constant, the gas molecules experience a decrease in volume. According to Boyle's law (P₁V₁ = P₂V₂), if the volume decreases, the pressure of the gas will increase.
Diagram X represents the initial state with larger volume, and diagram Y shows the final state with reduced volume. Since the temperature remains constant, the pressure must change to counterbalance the change in volume.
As the volume decreases, the gas molecules have less space to move around, and they collide more frequently with the container walls. This increased collision rate results in a higher pressure exerted by the gas on the container walls.
Hence, the most likely outcome when the scientist changed the size of the container is that the pressure increased, which corresponds to option C.
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If my skater begins at a height of ______ meters, then the skater will have enough total energy to successfully complete the skate park ramp from start to finish. (Fill in the blank with a height between 0 and 10 meters.)
JUST PLS FILL IN THE BLANK
Answer: 5
Explanation:
If my skater begins at a height of 5 meters, then the skater will have enough total energy to successfully complete the skate park ramp from start to finish
Brainliest me
If my skater begins at a height of 5 meters, then the skater will have enough total potential energy to successfully complete the skate park ramp from start to finish.
If my skater starts at a height of 5 metres, he or she will have enough total potential energy to complete the skate park ramp from beginning to end. Potential energy is a physics notion that is affected by an object's height and mass. Because of its position in a gravitational field, an object at a specific height above the earth has potential energy.
The skater has a particular amount of potential energy connected with their starting height of 5 metres. As they go down the ramp, this potential energy is turned into kinetic energy, or motion energy. As the skater moves down the ramp, their speed rises, as does their kinetic energy.
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PLEASE HELP If the melting point of copper is 1,085 °C, then the __________ point is __________ °C.
Answer: freezing point is 1,085
Explanation: